Electromagnetic regulator.



A. KRAUSS.

ELECTROMAGNETIC REGULATOR.

APPLICATION FILED JULY 30,1913.

1,162,174. Patented Nov. 30, 1915.

v \l\ mu y F L m W 8W 2Q A fg COLUMBXA PLANOGRAPH cm, WASHINGTON, D c.

UNITED STATES PATENT orricn.

.ADOLF KRAIISS, OF CANNSTATT, GERMANY, ASSIGNOR TO THE FIRM OF ROBERT BOSCH, OF STUTTGART, GERMANY.

ELECTROMAGNETIC REGULATOR.

Application filed July 30, 1913.

" To all whom it may concern make and use the same.

The present invention relates to resistance regulators comprising a mass of looselypacked divided resistance material on which presses a? pressure member, preferably a floating armature, in response to an electromagnet excited with currentfrom the circuit' to be regulated and effective to thereby vary the resistance of the field circuit of the generator. In such regulators it is desirable to be able to adjust the normal resistance between the circuit terminals, that is the resistance between the circuit termi nals when. the electromagnet is not excited, because the value to which the regulated quantity is to.be maintained constant is thereby made adjustable at will, or a ce r tain value may be maintained constant 1n spite of variations of other factors entering into consideration. Tests have shown that even relatively small variations of the normal pressure exerted upon a resistance mass of this kind produces comparatively large changes in the resistance between the circuit terminals, so that the means herein disclosed are'of much importance in adapting the regulator to its best performance under given requirements. In the preferred construction disclosed herein, the adjustment of the normal resistance between the circuit terminals of the regulator is attained by adjusting the normal pressure of the floating armature on the mass of resistance material.

In the accompanying drawings, illustrating the preferred and a modified arrangement within my invention, Figiire 1 represents a central vertical section of the preferred embodiment; Fig. 2 represents a central vertical section of a modified construction: Fig. 3 represents a side view of a portion of the regulator of Fig. 2, and Fg. 4 represents a cross-section on line iel-. of Fig. 2.

eferring to Fig. 1, a is a container for the Specification of Letters Patent.

Patented Nov. 30, 1915.

Serial No. 781,929.

mass 3) of loosely-packed divided resistance material, such as grains of carbon to which may be added, if desired, a quantity of mica flakes in order to form a resilient resistance mass. The electromagnet d is of the ordinary pot form having annular arms of magnetic material as iron, with an exciting winding to between the arms. The floating armature 0 of magnetic material forms a pressure member for the resistance mass 5, and the flexible ring it of inelastic insulating material such as fabric is fastened to the armature c and to the container a. The armature c is fastened to the post 6, which extends through a central opening in the magnet and is fastened at its other end to the flat spring 7 supported on blocks from the magnet as shown. Thus the armature is supported from the spring f in addition to being supported by the flexible ring it, but the spring 7' is so selected that it is stiffer than the ring it, whereby the armature 0 may be adjusted in depressed position by the pressure of the sliding pin 2' on the yoke spring m supported by the spring Thus the normal resistance of the mass I) may be adjusted at will by adjusting the screw n having the conical end 0 to thereby adjust the contact pressure of the floating armature c. The container a is made of electrical conducting material and is electrically insulated from the parts 0, c, and on the sides from the resistance mass 1) in any suitable way, while the yoke or cover 9 of metal is insula'ed from the magnet (Z. Thus the current flowing into the circuit terminal t passes with substantially uniform density from the bottom of the container a through the resistance mass 7), thence to and out of the circuit terminal 2?. The exciting winding to has outgoing term' ials (not shown) which are adapted to be connected to the circuit to be regulated. Upon variations of the ouantitv to be regulated, the current in winding w varies and thereby alters the pull of the electromagnet on the floating armature and thus alters the resistance of the mass 6 between the circuit terminals t and t of the regulator.

The modification shown in Figs. 2. 3 and 4 differs from that described in the means for adjusting the normal resistance between the circuit terminals of the regulator. In this modification, the container (1 for the resistance mass is provided with two inclined slots 70 through which the screws 7' extend into threaded holes in the magnet (Z. The tlatspring f is eil'ective on the floating armature 0 through the post 6 and,'as be fore, is stronger than the flexible insulating ring it. Thus by adjusting the position of the container at relatively to the mag net (Z, the pressure of the floating armature c on the resistance mass 3), is QifQCtiYQ to adjust the normal resistance thereof between the circuit' terr inalstand 21'. The screws j are then only partly tightened up untilthe desiredoperation-of the regulator is secured by subsequent andinoreprecise adjustment of the air gap between the floating-armature c'and theouter faces of the polesof the magnet'd, and of the pressure or the flat spring 7-, whereupon thescrews hare tully tightened, and the screwZ securedin place to'fix the position of tie parts. The methodot operation ofth s arrangement in regulating elec riccircuits will be apparent from the drawings and the previous description.

Having thus described my inventionwhat I claim is:

1. n a regulator 'hai 'ingcircuit'terminals for connection to an electric circuit, an electroma 'net, a variable electrical resistance embodyingresistant; material and a. container therefor, a pressure irember effectire oirthe resistance material to Vary its electrical resistance in 1 response to 1 the electromagnet, ile:\'ible material fiastenedto the pressure member and to the container, a yield support fortlie pressure'member, and m'eans i'or adjusting at'will the normal ice of theresistancematerialbetween the circuit terminals; substantially as described.

In a re ulator an electromagnet, a vari able electrical i is ance embodying resistance material anl a container therefor, a pressure member effective on the 1112158 to Vary its electrical resistance in response'to the ele'ctromagnet, flexible material fastened to the pressure mcinber and to the container, and pressure adjusting HIOQRS OEQbOClf/lDg a spri which is-stiil'erthan the i "ible material, for adjusting at will'the pressure of the pressure member on the resistance material in order to adjust the normal resistance thereof between the'circuit terminalsg-suh stantially described.

In a regulator hai ing circuit terminals for connection to an electric circuit, an electromagnet, a variable electrical resistance embodying resistance material and a container therefor, a floating armature effective by pressure to vary the electrical resistance of the resistance niaterial in response to the electromagn'et, flexible material fastened to the floating armature and to the container, a resilient member sue )ortm the floatin armature in contact with the resistance mate- I anilmeans for adjusting the pressure of the ll ating armature on the resistance mate rial in order to adjust at will the normal resistance thereof between the circuit terminals; substantially as described.

Ina regulator having circuit terminals for connection to an electric circuit, an electromagnet, a variable electrical resistance embodying a mass ofresist ice material and a cont iner therefor, a floating a "mature efwlroon the mass to wary its electrical resistance in response to the electromagnct, a st p of fabric fastened to the floatingzarma- .ieand to the contai er, a resilient membersupporting the floating armature in contact \i'ith'the resistance material, and means torad usting thepressure of the floating armature on the mass of resistance material in order-to adjust will the normalresistanco thereof between the circuit terminals; substantially as described.

5. ln a-regulator hai 'ing circuit terminals forconnectionto an electric circuit, an electromagnet, a variable electrical resistance em'bo ing resistance material and a. con tainer therefor, a floating armature effective by pressure onthe resistance mass to var its electrical resistance in response to the electromagnet,a flat spring supporting the floating armature in contact with the 'resi'stance material, =a yoke spring fastened to the fiat spring 'and means for adjusting the :pressure on the yoke spri in order to N ry llllQzDI'QSSllYQ of the floating arm ature on the resista ce mass to thereby just at will the horn al resistance thereof between the circuit termi als; substantially as described.

'5. in a regulator havin circuit terminals for'coanection to an electric circuit, an electromagnet, a variable electrical resistance embodying resistance material, ailoating arare effective by pressure'on the resistance material to Yary its electricalresistance in'response to the elcctroma ct, a spring srpporting'the floating armature'in contact with the resistance .iaterial'and a member having conical end designed to denress the springin order toyary the pressure of the floating: armature on the resistance material to thereby adjust at will the normal resistance of the resistance mass'bctwecn the circuit terminals substantially:as deseribed.

ln testimony whereof I aflix my signature, in presence of two witnesses.

'ADOLF 1 KRAUSS.

Witnesses PAUL om -ART, HmmANN SCHNEIDER.

Copies)? tliisvpatent may be obtained for five cents each, by addressing the Commissioner of Patents, Washingtomi). C. 

